Dragoon Apps

Deleting comments one by one can be a pain. Especially when you have a lot of spam or unapproved comments to get rid of. That’s where TL Bulk Delete Comment comes in. This plugin makes deleting comments a breeze, so you can focus on more important things.
With just a few clicks, you can delete all the comments that are cluttering up your blog or website. It’s the perfect way to keep your site looking neat and tidy.
Each action below can delete comments which belong to a respective category.
<ul>
<li>Delete all comments</li>
<li>Delete Spam comments</li>
<li>Delete Unapproved comments</li>
<li>Delete Trash comments</li>
<li>Delete unapproved comments of which URL field has a link</li>
<li>Delete unapproved comments which contains link in comment</li>
</ul>

TL Bulk Comment Delete

Allows to delete all comments or a certain comments such as unapproved, spam, trash ones.

WP Chill

Silkalns

Cristian Raiber

A very useful plugin for everyone using WordPress. Adds reCaptcha security to the WordPress login form, register form and comment form. This plugin could help your blog get rid of a lot of spam comments or brute-force attacks.
Nothing gets passed it if the reCaptcha doesn’t validate.
A few notes about the plugin:
<ul>
<li>Supports audio or image captcha types</li>
<li>Can generate the reCaptcha image / audio type in a number of predefined languages</li>
<li>Adds reCaptcha protection to the WordPress login form</li>
<li>Adds reCaptcha protection to the WordPress register form</li>
<li>Adds reCaptcha protection to the WordPress comment form</li>
<li>Adds reCaptcha protection to the WordPress recover password form</li>
</ul>

Uber reCaptcha

This plugin adds the reCaptcha form to the WordPress login form, recover password form, register form and comment form.

TL Bulk Comment Delete vs Uber reCaptcha